It seems like they keep bumping up the base level quality for youtube videos and it has just reached a point where my 1.33ghz ibook w/ 1.5gig ram can no longer play youtube videos without skipping badly. It was on the edge for about a year, and this last bump in quality has pushed the playback into the realm of unwatchable.
The irony is that the millions of netbooks that are being sold have similar benchmarks and play the content just as poorly. I dont know if i should be blaming youtoube or hardware manufacturers here, but what gives?